{"id":"CVE-2026-116266","aliases":[],"cve":{"records":[{"id":"CVE-2026-116266","source":"CPANSec","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-25T18:05:02.235Z","published":"2026-10-28T17:32:28.565Z","modified":"2026-10-28T17:32:28.565Z"}],"publishers":[{"name":"CPANSec","role":"CNA","organizationId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","modified":"2026-10-28T17:32:28.565Z"}],"references":[{"url":"https://metacpan.org/release/DSKOLL/MIME-tools-5.521/changes","tags":["release-notes"],"source":"CPANSec"}],"weaknesses":[{"id":"CWE-436","description":"CWE-436 Interpretation Conflict","source":"CPANSec"}],"applicability":[],"prioritization":[]},"title":"MIME::Head versions from 5.518 before 5.521 for Perl decode a partly encoded multipart boundary without flagging the parse as ambiguous","titleSource":"CPANSec","descriptionSource":"CPANSec","description":"MIME::Head versions from 5.518 before 5.521 for Perl decode a partly encoded multipart boundary without flagging the parse as ambiguous.\n\nThe multipart_boundary() method decodes RFC 2047 encoded words anywhere in the boundary, but the ambiguity check only fires when the whole value is one encoded word. A boundary such as abc=?us-ascii?Q?def?= is used as abcdef, and ambiguous_content() returns false.\n\nEncoded words are not allowed in parameters, so other mail readers split the message on the literal value. A remote sender can hide an attachment from a filter that relies on ambiguous_content() while the recipient's mail client shows it.","score":null,"severity":"unknown","published":"2026-10-28T17:32:28.565Z","modified":"2026-10-28T17:32:28.565Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"","name":"MIME-tools","platforms":[],"versions":[{"version":"5.518","status":"affected","lessThan":"5.521","versionType":"custom"}],"defaultStatus":"unaffected","packageURL":"pkg:cpan/MIME-tools","cpes":[],"source":"CPANSec","url":"https://www.cve.org/CVERecord?id=CVE-2026-116266"}],"remediation":[{"text":"Upgrade to MIME-tools 5.521 or later.","source":"CPANSec","url":"https://www.cve.org/CVERecord?id=CVE-2026-116266"}],"references":["https://metacpan.org/release/DSKOLL/MIME-tools-5.521/changes"],"sources":[{"name":"CVE","id":"CVE-2026-116266","modified":"2026-10-28T17:32:28.565Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-116266"}],"assessments":[],"sourceAffected":[],"observedAt":"2026-10-29T14:34:58.783Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T07:45:30.596Z"},"coverage":[{"source":"NVD","status":"no-result","checkedAt":"2026-10-28T18:05:35.322Z","attemptedAt":"2026-10-28T18:05:35.322Z"},{"source":"GHSA","status":"no-result","checkedAt":"2026-10-28T18:05:35.537Z","attemptedAt":"2026-10-28T18:05:35.537Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-28T18:05:35.685Z","attemptedAt":"2026-10-28T18:05:35.685Z"},{"source":"EPSS","status":"no-result","checkedAt":"2026-10-28T18:05:35.495Z","attemptedAt":"2026-10-28T18:05:35.495Z"}],"evidence":[{"source":"ENISA EUVD","id":"EUVD-2026-112298","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-112298","modified":"Oct 28, 2026, 5:32:28 PM","checkedAt":"2026-10-28T18:05:35.685Z"}],"aiSummary":{"text":"MIME::Head versions 5.518 before 5.521 for Perl decode partly encoded multipart boundaries without flagging the parse as ambiguous, allowing a remote sender to hide attachments. The weakness is an interpretation conflict. The impact is uncertain.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T08:48:06.603Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-116266"}]}}